If number of triangles joining angular points of a n-sided polygon be 12n.find n

No of diagonals of a 12 sided polygon are

How many different triangles can be formed by joining the angular points of a polygon of n side ?find also the number of diagonals of the polygon .

Consider the convex polygon, which has 35 diagonals. Then match the following column. Column I, Column II Number of triangles joining the vertices of the polygon, p. 210 Number of points intersections of diagonal which lies inside the polygon, q. 120 Number of triangles in which exactly one side is common with that of polygon, r. 10 Number of triangles in which exactly two sides are common with that of polygon, s. 60

How many different triangles can be formed by joining the angular point of a decagon .find also the number of diogonal of the decagon

Let T_(n) be the number of all possible triangles formed by joining vertices of a n-side regular polygon . If T_(n+1)-T_(n)=10 ,then the value of n is -

Find the number of diagonals in a polygon with n sides.

The number of diagonals of a polygon of n sides is-

Let T_(n) denote the number of triangles which can be formed using the vertices of a regular polygon of n sides . If T_(n+1)-T_(n)=21 then find the values of n .

Let T_n denote of the number of triangles which can be formed using the vertices of a regular polygon of n sides If T_(n+1)-T_n=21 then n is

n_(1),n_(2)andn_(3) points are given on the sides BC ,CA and AB respectively of the triangle ABC . Find the number of triangles formed by taking these given points as vertices of a triangle .